paint method

@override void paint(PaintingContext context, Offset candleTop, Offset candleBottom)

Implementation

@override
void paint(PaintingContext context, Offset candleTop, Offset candleBottom) {
  final paint = Paint()
    ..color = color
    ..style = PaintingStyle.fill
    ..strokeWidth = 1;

  Offset center = annotationAlignment == AnnotationAlignment.Bottom
      ? candleBottom.translate(0, 20)
      : candleTop.translate(0, -20);

  var path = Path();
  switch (annotationAlignment) {
    case AnnotationAlignment.Bottom:
      path.moveTo(center.dx, center.dy - radius / 2);
      path.lineTo(center.dx - radius / 2, center.dy + radius / 2);
      path.lineTo(center.dx + radius / 2, center.dy + radius / 2);
      break;
    case AnnotationAlignment.Top:
      path.moveTo(center.dx, center.dy + radius / 2);
      path.lineTo(center.dx - radius / 2, center.dy - radius / 2);
      path.lineTo(center.dx + radius / 2, center.dy - radius / 2);
      break;
  }
  path.close();

  context.canvas.drawPath(path, paint);

  if (text != null) {
    final textSpan = TextSpan(
      text: text,
      style: textStyle ?? TextStyle(color: color, fontSize: 12),
    );

    final textPainter = TextPainter(
      text: textSpan,
      textDirection: TextDirection.ltr,
    );

    textPainter.layout(
      minWidth: 0,
      maxWidth: 80,
    );

    final offset = Offset(
      candleBottom.dx - textPainter.width / 2,
      annotationAlignment == AnnotationAlignment.Bottom
          ? candleBottom.dy + 2 * radius + textPainter.height + 5
          : candleTop.dy - 2 * radius - 2 * textPainter.height - 5,
    );
    textPainter.paint(context.canvas, offset);
  }
}